Hi, I'm trying to register custom menu widget using xml-rpc calls (it's possible with Extended api plugin). I'm using wp_register_sidebar_widget function but it seems to do nothing. I call it with those parameters:
wp_register_sidebar_widget( 'custom_menu_widget-1', 'My name', 'WP_Nav_Menu_Widget', array( 'description' => 'blogroll' ) );
I suspect 3rd parameter ('WP_Nav_Menu_Widget') may be wrong, but I can't find anywhere what should be output callback for standard custom menu widget. I can't and I don't want to edit function.php on the site. I wan't to register standard custom menu widget to enable it in a sidebar. Maybe there is another way to achieve this? Could anyone help me with that?